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square numbers crossnumbers logic chalkdust crossnumber number cryptic clues hexagons irreducible numbers doubling trigonometry time quadrilaterals tournaments coordinates prime numbers gerrymandering routes mean decahedra parabolas elections perfect numbers products rugby chess advent coins christmas dates pentagons graphs digits sums ave colouring digital products consecutive integers circles regular shapes factors grids probabilty angles combinatorics partitions cubics ellipses cube numbers division square roots shapes cards rectangles functions triangle numbers probability palindromes geometry axes the only crossnumber geometric mean averages people maths games floors means dominos speed binary even numbers tiling dodecagons geometric means addition proportion money triangles squares determinants remainders area polygons spheres balancing crossnumber consecutive numbers numbers expansions integration 2d shapes sequences pascal's triangle surds sum to infinity odd numbers median books 3d shapes polynomials dice multiplication unit fractions tangents menace clocks star numbers cryptic crossnumbers folding tube maps fractions matrices bases scales calculus planes quadratics digital clocks multiples integers indices albgebra sport arrows factorials symmetry percentages crosswords volume shape chocolate differentiation lines perimeter complex numbers range taxicab geometry sets algebra wordplay